Invalidation risk evaluation for prestressed cable bolt based on matter-element analysis

Based on field investigation into anchored slope, the influential factors induced the invalidation of prestressed cable bolt were systemically and comprehensively summarized, including the corrosion degree of steel strand and anchorage, the cement injection quality of anchor hole, the structure form of anchor, the soil/rock mass and the prestress loss rate, then the evaluation index system for the invalidation risk rank of prestressed cable bolt was set up. Further more, the invalidation risk evaluation model for prestressed cable bolt based on matter-element analysis theory is proposed. The paper determined the evaluation district matter-element matrix, traditional matter-element matrix, computed the weight of evaluation index and synthesizes related degree. At last, the risk rank of the prestressed cable bolt invalidation is gained. It is concluded that this method is demonstrated to be reasonable and feasible in practice by an example analysis.